21071712102 has 16 divisors (see below), whose sum is σ = 48163913472. Its totient is φ = 6020489160.

The previous prime is 21071712097. The next prime is 21071712133. The reversal of 21071712102 is 20121717012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250853674 + ... + 250853757.

It is an arithmetic number, because the mean of its divisors is an integer number (3010244592).

Almost surely, 2^21071712102 is an apocalyptic number.

21071712102 is an abundant number, since it is smaller than the sum of its proper divisors (27092201370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21071712102 is a wasteful number, since it uses less digits than its factorization.

21071712102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501707443.

The product of its (nonzero) digits is 392, while the sum is 24.

The spelling of 21071712102 in words is "twenty-one billion, seventy-one million, seven hundred twelve thousand, one hundred two".